Android应用开发 00：Jetpack Compose学习 生日贺卡 图片 Compose象限 名片

写一张生日贺卡

代码实现

package com.example.greetingcard

import android.media.Image
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.*
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Surface
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.layout.ContentScale
import androidx.compose.ui.tooling.preview.Preview
import com.example.greetingcard.ui.theme.GreetingCardTheme
import androidx.compose.ui.unit.dp
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.semantics.Role.Companion.Image
import androidx.compose.ui.unit.sp

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            GreetingCardTheme {
                // A surface container using the 'background' color from the theme
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colors.background
                ) {
                    Greeting("Happy Birthday, Tony!",
                        "- from Alice")
                }
            }
        }
    }
}

@Composable
fun Greeting(message: String, from: String) {
    Column {
        Text(
            text = message,
            fontSize = 36.sp,
            modifier = Modifier.fillMaxWidth()
                .wrapContentWidth(Alignment.CenterHorizontally)
                .padding(16.dp)
        )
        Text(
            text = from,
            fontSize = 24.sp,
            modifier = Modifier.fillMaxWidth()
                .wrapContentWidth(Alignment.CenterHorizontally)
        )
    }
}

@Composable
fun GreetingWithImage(message: String, from: String) {
    val image = painterResource(id = R.drawable.androidparty)
    // Greeting(message = message, from = from)
    Box {
        Image(
            painter = image,
            contentDescription = null,
            modifier = Modifier.fillMaxHeight()
                .fillMaxWidth(),
            contentScale = ContentScale.Crop
        )
        Greeting(message = message, from = from)
    }
}

@Preview(showBackground = true)
@Composable
fun GreetingCardPreview() {
    GreetingCardTheme {
        GreetingWithImage(
                    stringResource(R.string.happy_birthday_text),
            stringResource(R.string.signature_text)
                    )
    }
}

写一个任务管理器（图片）

代码实现

package com.example.taskmanager

import android.graphics.Picture
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.*
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Surface
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.layout.ContentScale
import androidx.compose.ui.modifier.modifierLocalConsumer
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import com.example.taskmanager.ui.theme.TaskManagerTheme

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            TaskManagerTheme {
                // A surface container using the 'background' color from the theme
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colors.background
                ) {
                    Show()
                }
            }
        }
    }
}

@Composable
fun TaskCompleteImage() {
    val image = painterResource(id = R.drawable.ic_task_completed)
    Image(painter = image,
        contentDescription = null
        )
}

@Composable
fun Show() {
    Column(
        modifier = Modifier
            .fillMaxWidth()
            .fillMaxHeight(),
        horizontalAlignment = Alignment.CenterHorizontally,
        verticalArrangement = Arrangement.Center
    ) {
        TaskCompleteImage()
        Text(
            text = stringResource(R.string.task_complete),
            fontWeight = FontWeight.Bold,
            modifier = Modifier.padding(top = 24.dp, bottom = 8.dp)
        )
        Text(
            text = stringResource(R.string.nice_work),
            fontSize = 16.sp
        )
    }
}

@Preview(showBackground = true,
showSystemUi = true)
@Composable
fun DefaultPreview() {
    TaskManagerTheme {
        Show()
    }
}

Compose象限（练习weight）

代码实现

package com.example.composequadrant

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.*
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Surface
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import com.example.composequadrant.ui.theme.ComposeQuadrantTheme

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            ComposeQuadrantTheme {
                // A surface container using the 'background' color from the theme
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colors.background
                ) {
                    ComposeQuadrant()
                }
            }
        }
    }
}

@Composable
fun TextFunc(text1: String, text2: String) {
    Text(text = text1,
        fontWeight = FontWeight.Bold,
        modifier = Modifier.padding(bottom = 16.dp)
    )
    Text(text = text2)
}

@Composable
fun ComposeQuadrant() {
    Column(
        modifier = Modifier.fillMaxSize()
            ) {
        Row(
            modifier = Modifier.weight(weight = 1f, fill = true)
        ) {
            Column(
                modifier = Modifier
                    .weight(1f, fill = true)
                    .fillMaxHeight()
                    .background(color = Color.Green)
                    .padding(16.dp),
                horizontalAlignment = Alignment.CenterHorizontally,
                verticalArrangement = Arrangement.Center,
            ) {
                Text(text = "Text composable",
                    fontWeight = FontWeight.Bold,
                    modifier = Modifier.padding(bottom = 16.dp)
                )
                Text(text = "Displays text and follows Material Design guidelines.",
                    textAlign = TextAlign.Justify)
            }
            Column(
                modifier = Modifier
                    .weight(1f, fill = true)
                    .fillMaxHeight()
                    .background(color = Color.Yellow)
                    .padding(16.dp),
                horizontalAlignment = Alignment.CenterHorizontally,
                verticalArrangement = Arrangement.Center,
            ) {
                Text(text = "Image composable",
                    fontWeight = FontWeight.Bold,
                    modifier = Modifier.padding(bottom = 16.dp)
                )
                Text(text = "Creates a composable that lays out and draws a given Painter class object.",
                    textAlign = TextAlign.Justify)
            }
        }
        Row(
            modifier = Modifier
                .weight(weight = 1f, fill = true)
                .background(color = Color.Red)
        ) {
            Column(
                modifier = Modifier
                    .fillMaxHeight()
                    .weight(1f)
                    .background(color = Color.Cyan)
                    .padding(16.dp),
                horizontalAlignment = Alignment.CenterHorizontally,
                verticalArrangement = Arrangement.Center,
            ) {
                Text(text = "Row composable",
                    fontWeight = FontWeight.Bold,
                    modifier = Modifier.padding(bottom = 16.dp)
                )
                Text(text = "A layout composable that places its children in a horizontal sequence.",
                    textAlign = TextAlign.Justify)
            }
            Column(
                modifier = Modifier
                    .fillMaxHeight()
                    .weight(1f)
                    .background(color = Color.LightGray)
                    .padding(16.dp),
                horizontalAlignment = Alignment.CenterHorizontally,
                verticalArrangement = Arrangement.Center,
            ) {
                Text(text = "Column composable",
                    fontWeight = FontWeight.Bold,
                    modifier = Modifier.padding(bottom = 16.dp)
                )
                Text(text = "A layout composable that places its children in a vertical sequence.",
                    textAlign = TextAlign.Justify)
            }
        }
    }
}

@Preview(showBackground = true,
showSystemUi = true)
@Composable
fun DefaultPreview() {
    ComposeQuadrantTheme {
        ComposeQuadrant()
    }
}

个人名片

代码实现

package com.example.mybusinesscard

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.*
import androidx.compose.material.Icon
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Surface
import androidx.compose.material.Text
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.outlined.Email
import androidx.compose.material.icons.outlined.Phone
import androidx.compose.material.icons.outlined.Star
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.modifier.modifierLocalConsumer
import androidx.compose.ui.modifier.modifierLocalOf
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import com.example.mybusinesscard.ui.theme.MyBusinessCardTheme

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            MyBusinessCardTheme {
                // A surface container using the 'background' color from the theme
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colors.background
                ) {
                    Show()
                }
            }
        }
    }
}

@Composable
fun Topic() {
    Image(
        painter = painterResource(
            id = R.drawable._645857859942
        ),
        contentDescription = null,
        modifier = Modifier.size(100.dp, 160.dp)
    )
    Text(
        text = "Tony Wei",
        fontWeight = FontWeight.Bold,
        fontSize = 40.sp
    )
    Text(
        text = "Android Primary Engineer"
    )
}

@Composable
fun Information() {
    Row(
        modifier = Modifier.fillMaxWidth(),
    ) {
        Spacer(modifier = Modifier.width(35.dp))
        Icon(
            modifier = Modifier
                .align(Alignment.CenterVertically)
                .size(50.dp, 50.dp),
            imageVector = Icons.Outlined.Phone,
            contentDescription = null,
            tint = Color.Blue
        )
        Spacer(modifier = Modifier.width(40.dp))
        Text(
            text = "+86 18390856237",
            fontWeight = FontWeight.Bold,
            fontSize = 20.sp,
            modifier = Modifier.align(Alignment.CenterVertically)
        )
    }
    Row(
        modifier = Modifier.fillMaxWidth(),
    ) {
        Spacer(modifier = Modifier.width(35.dp))
        Icon(
            modifier = Modifier
                .align(Alignment.CenterVertically)
                .size(50.dp, 50.dp),
            imageVector = Icons.Outlined.Star,
            contentDescription = null,
            tint = Color.Blue
        )
        Spacer(modifier = Modifier.width(40.dp))
        Text(
            text = "@ShowM3theCode",
            fontWeight = FontWeight.Bold,
            fontSize = 20.sp,
            modifier = Modifier.align(Alignment.CenterVertically)
        )
    }
    Row(
        modifier = Modifier.fillMaxWidth()
            .padding(bottom = 28.dp),
    ) {
        Spacer(modifier = Modifier.width(35.dp))
        Icon(
            modifier = Modifier
                .align(Alignment.CenterVertically)
                .size(50.dp, 50.dp),
            imageVector = Icons.Outlined.Email,
            contentDescription = null,
            tint = Color.Blue
        )
        Spacer(modifier = Modifier.width(40.dp))
        Text(
            text = "[email protected]",
            fontWeight = FontWeight.Bold,
            fontSize = 20.sp,
            modifier = Modifier.align(Alignment.CenterVertically)
        )
    }
}

@Composable
fun Show() {
    Column(
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally,
        modifier = Modifier
            .fillMaxSize()
            .padding(start = 16.dp, end = 16.dp)
    ) {
        Topic()
    }
    Column(
        verticalArrangement = Arrangement.Bottom,
        horizontalAlignment = Alignment.CenterHorizontally,
        modifier = Modifier
            .fillMaxSize()
            .padding(start = 16.dp, end = 16.dp)
    ) {
        Information()
    }
}

@Preview(showBackground = true,
showSystemUi = true)
@Composable
fun DefaultPreview() {
    MyBusinessCardTheme {
        Show()
    }
}